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The Secret of Grey Walls

The Lone Piners head for Clun in this winter adventure. They make the castle HQ3 as they discover sinister characters and strange things being done with removal lorries.

Newnes (1947) Full Text
Dymocks (1952) Australian edition
Newnes (1958) Full Text Library copy available
Het Spectrum (1962) Dutch edition
Molino (1963) Spanish edition
Merlin (1967)
Collins Budget (1972)
Armada (1975)
Goodchild (1983)
Scholastic (1995)
Girls Gone By (2007) Full Text